decating

1. slicksimon Regular Poster Joined: Sep 2008 leicester Posts: 339 A 1999 mk1 vtr

   #1 12th May 2009, 23:12

   hi guys. I've got a 1999 mk1 vtr and thinking about decating it but because I only have one lambda sensor before the cat will I need to sleeve it.
   Also will this affect my fuel consumption ?
   Thanks
2. evans1089 Saxperience Post Whore Joined: Jun 2007 Chesterfield Posts: 8935 Ibiza Cupra 204bhp

   #2 12th May 2009, 23:23

   it will affect the mixture of fuel yes and will run on more fuel than usual.
   And you will need a sleeve or just make one
3. slicksimon Regular Poster Joined: Sep 2008 leicester Posts: 339 A 1999 mk1 vtr

   #3 12th May 2009, 23:30

   Surely tho it shudnt affect the car because the sensor is mesuring the gasses before the cat so surely it shudnt be any different if I leave the sensor in
4. Quick Saxperience Post Whore Joined: Mar 2003 United Kingdom (England) Posts: 7064

   #4 12th May 2009, 23:52

   No need to sleeve a single lambda engine. As it reads the gases before the cat.
   
   Keep the cat in a safe place for MOT time.
   
   Shouldn't effect the fuel consumption.
5. Ryanp Super Moderator Joined: Feb 2004 Tonbridge United Kingdom (England) Posts: 38236 Vtr, 172, throttle bodied track slut

   #5 12th May 2009, 23:56

   Quote:

   Originally Posted by evans1089 it will affect the mixture of fuel yes and will run on more fuel than usual. And you will need a sleeve or just make one

   any reason you feel it would need one when the sensor is before the cat you are removing?
6. Sparco_Tom Saxperience Addict Joined: Jan 2007 Aylesbury, Bucks Posts: 12836 Yeaaahh Fiesta

   #6 13th May 2009, 01:22

   lambda is infront of the cat which isnt a problem, you wont need to touch it when removing the cat
7. titchster Saxperience Forum Bum Joined: Jan 2008 Down't road from Sheffield Posts: 4641 Was:16v 106 XS ..... Now: Import 1.8 MX5

   #7 13th May 2009, 01:26

   As said, it's only cars with 2 lamdas that need one sleeving, you sleeve the second one, just so it thinks the cat is still working efficiently. First one controls fuelling, so whether the cat is there or not, this isn't affected.
8. slicksimon Regular Poster Joined: Sep 2008 leicester Posts: 339 A 1999 mk1 vtr

   #8 13th May 2009, 08:03

   cool thanks for the help
9. evans1089 Saxperience Post Whore Joined: Jun 2007 Chesterfield Posts: 8935 Ibiza Cupra 204bhp

   #9 13th May 2009, 08:54

   Quote:

   Originally Posted by Ryan any reason you feel it would need one when the sensor is before the cat you are removing?

   i do apologise i have a janspeed manifold.. and a mark2